Scilab Function size - size of objects
Calling Sequence
- y=size(x [,sel])
- [nr,nc]=size(x)
Parameters
- x
: matrix (including transfer matrix) or list or linear system (syslin)
- y
: 1x2 integer vector or integer number
- sel
: a scalar or a character string
- nr,nc
: two integers
Description
Applied to :
a matrix (constant, polynomial, string, boolean, rational) x, with only one lhs argument size returns a 1x2 vector [number of rows, number of columns]. Called with LHS=2, returns nr,nc = [number of rows, number of columns]. sel may be used to specify what dimension to get:
1 or 'r'
: to get the number of rows
2 or 'c'
: to get the number of columns
'*'
: to get the product of rows and column numbers
Applied to:
a list it returns the number of elements. In this case only y=size(x) syntax can be used
Applied to:
a linear system, y=size(x) returns in y the (row) vector [number of outputs, number if inputs] i.e. the dimension of the corresponding transfer matrix. The syntax [nr,nc]=size(x) is also valid (with (nr,nc)=(y(1),y(2)). If x is a linear system in state-space form, then [nr,nc,nx]=size(x) returns in addition the dimension nx of the A matrix of x.
Applied to:
an hypermatrix y=size(x) returns the vector of hypermatrix dimensions. [n1,n2,...nn]=size(x) returns the hypermatrix dimensions. ni=size(x,i) returns the ith dimension and size(x,'*') returns the product of dimensions.
Examples
[n,m]=size(rand(3,2))
[n,m]=size(['a','b';'c','d'])
x=ssrand(3,2,4);[ny,nu]=size(x)
[ny,nu]=size(ss2tf(x))
[ny,nu,nx]=size(x)
See Also